now there's another problem involving sandy. floodwaters damaged some critical police evidence and now it's impacting some trials. cnn's mary snow has the story for us. >> reporter: this flood-damaged warehouse right on new york harbor, can actually clog the city's overflowing criminal system for years to come. it sits in an area of brooklyn devastated by superstorm sandy. inside it, there are thousands of pieces of police evidence, ranging from dna to narcotics to guns that right now can't be touched. >> significant flooding has taken place. no question about it. we're still trying to sort through this and, you know, assess the total damage. it's a big job. >> reporter: that was back in november. the police department says it still hasn't been able to get into this facility and a second one because sewage contamination has made them unsafe. trials can't wait. cnn's legal contributor paul callan is a cnn legal contributor. >> if evidence that's been damaged is critical to proving a case. >> reporter: so far there have been six c